CN101881872A - Lens driver - Google Patents
Lens driver Download PDFInfo
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- CN101881872A CN101881872A CN2010101678786A CN201010167878A CN101881872A CN 101881872 A CN101881872 A CN 101881872A CN 2010101678786 A CN2010101678786 A CN 2010101678786A CN 201010167878 A CN201010167878 A CN 201010167878A CN 101881872 A CN101881872 A CN 101881872A
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- China
- Prior art keywords
- lens
- shape memory
- memory alloy
- mentioned
- alloy wire
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/06—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like
- F03G7/061—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like characterised by the actuating element
- F03G7/0614—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like characterised by the actuating element using shape memory elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0053—Driving means for the movement of one or more optical element
- G03B2205/0076—Driving means for the movement of one or more optical element using shape memory alloys
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Lens Barrels (AREA)
Abstract
The present invention relates to lens driver.Its purpose is to shorten the length of employed shape memory alloy wire.The guide that guiding lens mount (18) can only move to above-mentioned optical axis (O) direction comprises the elastomeric element (20) that is configured between lens mount (18) and the housing (12).This elastomeric element (20) support of lens frame (18) makes that this lens mount (18) can only be shifted to optical axis (O) direction under the state that radially lens mount (18) has been carried out the location.Make lens mount (18) to the travel mechanism that optical axis (O) direction moves, by near the outer wall of the cylindrical portion that is configured in lens mount (18) (182) and the shape memory alloy wire (28) of the wire that cooperates with lens mount formation.This shape memory alloy wire (28) has at least one flex point (28-1).
Description
Technical field
The present invention relates to lens driver, relate in particular to the lens driver that has used marmem in the actuator.
Background technology
The actuator that actuator of using as the automatic focus of camera and varifocal are used, known have (drive unit) linear actuator that has used marmem (Shape Memory Alloy:SMA).
For example, Japanese kokai publication hei 9-127398 communique (patent documentation 1) discloses a kind of lens actuating device simple in structure.Patent documentation 1 disclosed lens actuating device is provided with the mobile lens portion that uses guide rod supports and move between the fixed lens of mirror main body both sides in the mirror main body.Between mobile lens portion and two sides' fixed lens portion, dispose spring member.At least one side's spring member is made shape memory alloy spring.By spring member being heated or cooling off and control moving of mobile lens portion.
In addition, TOHKEMY 2006-98829 communique (patent documentation 2) disclose a kind of can be smoothly and mobile lens promptly, and can be assembled in the lens driver that is miniaturized in the portable information terminal equipment.These patent documentation 2 disclosed lens drivers have: keep lens lens frame (lens mount), have and support this lens frame (lens mount) and make it can only be to the fixed frame of the tubular support portion that optical axis direction moves and can be at the flexible volute spring of optical axis direction.Volute spring exposes and is the configuration of concentric shape to the outside of tubular support portion, and comprises because the shape memory alloy spring that is formed by marmem that the temperature variation that causes because of switch on/not switching on is stretched at optical axis direction.The outer peripheral face cylindraceous of lens frame (lens mount) is entrenched in the inner peripheral surface of the tubular support portion of fixed frame sliding freely.
As patent documentation 2 disclosed embodiments, volute spring has front side volute spring and the rear side volute spring that is with the optical axis the concentric shape configuration that is the center in the outside of tubular support portion.Front side volute spring and rear side volute spring from the front side of optical axis direction and rear side to the lens frame reinforcing.Front side volute spring and rear side helical spring at least one side form with marmem.
Patent documentation 1: Japanese kokai publication hei 9-127398 communique (paragraph 0015～0017, Fig. 3, Fig. 4)
Patent documentation 2: TOHKEMY 2006-98829 communique (paragraph 0009～0020, Fig. 1～Fig. 5)
In above-mentioned patent documentation 1 disclosed lens actuating device and patent documentation 2 disclosed lens drivers, there is the problem of the following stated respectively.
In patent documentation 1 disclosed lens actuating device, support mobile lens portion movably with guide rod.That is, guide rod is as the guide that only guides mobile lens portion at optical axis direction.Utilize the motion of focus direction (optical axis direction) of the slipping plane control mobile lens portion of guide rod.Therefore, (slipping plane) has the friction force effect between mobile lens portion and guide rod.With regard to this guide, shape memory alloy spring need overcome this friction force and mobile lens portion is only moved to optical axis direction.Its result must use the big spring of acting force (driving force) as shape memory alloy spring.In other words, the price of shape memory alloy spring increases.In addition, above-mentioned friction force also reaches sometimes and hinders the thrust (driving force that shape memory alloy spring produces; Acting force) degree.
In addition, in patent documentation 1, because shape memory alloy spring is done curl, thereby the length of shape memory alloy wire that constitutes this shape memory alloy spring is elongated.
In patent documentation 2 disclosed lens drivers, expose to the outside of tubular support portion and dispose shape memory alloy spring.Therefore, the size in length and breadth of lens driver increases.On the contrary, if reduce the size in length and breadth of lens driver, then the diameter at the last lens that keep of lens frame (lens mount) also diminishes.
In addition, in patent documentation 2, lens frame (lens mount) is configured in sliding freely on the inner peripheral surface of tubular support portion of fixed frame.That is, the tubular support portion of fixed frame is as the guide that lens frame (lens mount) is only guided to optical axis direction.Therefore, between the inner peripheral surface of the tubular support portion of the outer peripheral face cylindraceous of lens frame (lens mount) and fixed frame, the friction force effect is arranged.Therefore, shape memory alloy spring need overcome this friction force and lens frame (lens mount) is only moved to optical axis direction.Its result must use the big spring of acting force (driving force) as shape memory alloy spring.In other words, the price of shape memory alloy spring increases.
Same with above-mentioned patent documentation 1, in patent documentation 2, because shape memory alloy spring is done curl, thereby the length of shape memory alloy wire that constitutes this shape memory alloy spring is elongated.
Summary of the invention
Therefore, problem of the present invention is to provide a kind of lens driver, and this lens driver need not to make the lens mount that keeps lens to slide with respect to other parts, and lens mount is only moved to optical axis direction.
Another problem of the present invention is to provide a kind of lens driver, and this lens driver need not to reduce lens diameter just can dwindle size in length and breadth.
Another problem of the present invention is to provide a kind of lens driver, and this lens driver can shorten the length of employed shape memory alloy wire.
Other purpose of the present invention will will be clearer and more definite along with following explanation.
According to the present invention, can obtain following lens driver, this lens driver 10,10A, 10B possess: lens mount 18,18A with the cylindrical portion 182 that is used to keep lens barrel 11; The support of lens frame makes the housing 12 that this lens mount can only move to optical axis O direction; Make lens mount to travel mechanism that optical axis O direction moves; And the guiding lens mount guide that can only move to optical axis direction, it is characterized in that, guide comprises and is configured in lens mount 18, elastomeric element 20 between 18A and the housing 12, this elastomeric element support of lens frame 18,18A makes radially to lens mount 18, this lens mount can only be shifted to optical axis O direction under the state that 18A has carried out locating, travel mechanism is by near the outer wall of the cylindrical portion 182 that is configured in lens mount and the shape memory alloy wire 28 of the wire that cooperates with lens mount, 28A, 28B constitutes, and this shape memory alloy wire has at least one flex point 28-1～28-4.
In the lens driver 10 of the invention described above, 10A, 10B, elastomeric element 20 can be made of a pair of leaf spring 22,24 of the optical axis O direction both sides of the cylindrical portion 182 that is arranged on lens mount 18,18A.This occasion, each of a pair of leaf spring 22,24 can have and be installed in the interior all side ends 222,242 on lens mount 18, the 18A and be installed in outer circumferential side end 224,244 on the housing 12. Lens mount 18,18A can have from cylindrical portion 182 outstanding to the radial direction outside, and at least one teat 184,186 that cooperates with shape memory alloy wire.Housing 12 can be reached from the last side cover 16 of upside covering lens mount by actuator base 14, the 14A of the lower side that is disposed at lens mount and constitute.This occasion, lens driver can also have on the actuator of being fixed on base 14, the 14A, and first and second electrode 31,32, the 32A that are electrically connected respectively with first and second end of shape memory alloy wire 28,28A, 28B.
In the lens driver 10 of first mode of the present invention, shape memory alloy wire 28 has a flex point 28-1, and the angle θ 1 of this flex point 28-1 is less than 90 °.
In the lens driver 10A of second mode of the present invention, shape memory alloy wire 28A has a plurality of flex point 28-1～28-3, and the angle θ 2 of each flex point is less than 45 °.
In the lens driver 10B of Third Way of the present invention, lens mount 18 has from cylindrical portion 182 outstanding to the radial direction outside in relative mutually position, and first and second teat 284,186 that cooperates with shape memory alloy wire 28B, first and second electrode 31,32A are configured in the two ends of actuator base 14A respectively, and shape memory alloy wire 28B comprises the circular-arc part 283B that is circular-arc configuration along the outer wall of the cylindrical portion 182 of lens mount 18A.This occasion, shape memory alloy wire 28B has a plurality of flex point 28-1～28-4, and the angle θ 3 of each flex point is less than 90 °.
In addition, certainly, above-mentioned attached reference marks is put on for ease of understanding, nothing but an example, and is not to be defined in this.
Effect of the present invention is as follows.
According to the present invention, because the elastomeric element support of lens frame that is disposed between lens mount and the housing makes that this lens mount can only be shifted to optical axis direction under the state that radially lens mount is positioned, thereby need not to make lens mount to slide with respect to other parts, and lens mount is only moved to optical axis direction.In addition, since make lens mount to travel mechanism that optical axis O direction moves by the outer wall of the cylindrical portion that is configured in lens mount near and the shape memory alloy wire of the wire that cooperates with lens mount constitute, this shape memory alloy wire has at least one flex point, thereby need not to reduce lens diameter and just can dwindle size in length and breadth.Have again,, thereby can shorten the length of employed shape memory alloy wire owing to travel mechanism is made of the shape memory alloy wire of the wire with at least one flex point.
Description of drawings
Fig. 1 is the stereographic map of observing the outward appearance of lens driver from the top in oblique the place ahead of first embodiment of the present invention.
Fig. 2 is the stereographic map that has omitted lens barrel and observed from the top in oblique the place ahead from lens driver shown in Figure 1.
Fig. 3 is the stereographic map that has further omitted last side cover and observed from the top in oblique the place ahead from lens driver shown in Figure 2.
Fig. 4 is an exploded perspective view of observing lens driver shown in Figure 2 from the top in oblique the place ahead.
Fig. 5 is the front view of lens driver shown in Figure 3.
Fig. 6 is the local amplification stereogram that amplifies the major part of expression lens driver shown in Figure 5.
Fig. 7 be second embodiment of the present invention at the stereographic map of observing lens driver under the state that has omitted lens barrel and last side cover, above oblique the place ahead.
Fig. 8 is the front view of lens driver shown in Figure 7.
Fig. 9 be the 3rd embodiment of the present invention at the stereographic map of observing lens driver under the state that has omitted lens barrel and last side cover, above oblique the place ahead.
Figure 10 is a stereographic map of observing lens driver shown in Figure 9 from the top at oblique rear.
Figure 11 is the front view of lens driver shown in Figure 9.
Figure 12 is the stereographic map of configuration of lens mount, shape memory alloy wire and the pair of electrodes of expression lens driver shown in Figure 9.
Among the figure:
10,10A, 10B-lens driver, 11-lens barrel (lens subassembly),
12-framework (housing), 14,14A-actuator base, the last side cover of 16-,
18,18A-lens mount, the 182-cylindrical portion, 184, the 186-teat,
The 20-elastomeric element, 22, the 24-leaf spring, 26,26A-leaf spring frame,
28, the shape memory alloy wire of 28A, 28B-wire,
28-1～28-4-flex point (inflection point), 281-first straight line portion,
282,282A-second straight line portion, 283,283A, 283B-connecting portion,
283A1,283B1-first connect straight line portion, and 283A2,283B2-second connect straight line portion,
283A3-the 3rd connects straight line portion, and 283B3-connects circular-arc part,
31-first electrode, 32,32A-second electrode, the O-lens axis,
AFL-automatic focus lens, the angle of θ 1, θ 2, θ 3-flex point.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.
The lens driver 10 of first embodiment of the present invention is described referring to figs. 1 through Fig. 4.Fig. 1 is a stereographic map of observing the outward appearance of lens driver 10 from the top in oblique the place ahead.Fig. 2 is at the stereographic map of observing lens driver 10 under the state that has omitted lens barrel 11 above oblique the place ahead.Fig. 3 is at the stereographic map of observing lens driver 10 under the state that has omitted lens barrel 11 and last side cover 16 above oblique the place ahead.Fig. 4 is at the exploded perspective view of observing lens driver 10 under the state that has omitted lens barrel 11 above oblique the place ahead.
At this, as shown in Figures 1 to 4, rectangular coordinate system X, Y, Z have been used.To state shown in Figure 4, in rectangular coordinate system X, Y, Z, X-direction is fore-and-aft direction (depth direction) at Fig. 1, and Y direction is left and right directions (Width), and Z-direction is above-below direction (short transverse).To example shown in Figure 4, above-below direction Z is the optical axis O direction of lens at Fig. 1.
But, under the situation that reality is used, optical axis O direction, promptly Z-direction becomes fore-and-aft direction.In other words, the last direction of Z axle become the place ahead to, the following direction of Z axle become the rear to.
Illustrated lens driver 10 for example be contained in can the portable phone of self-focusing band camera on.Lens barrel (lens subassembly) 11 as the automatic focus lens AFL of moving lens in comprising, lens driver 10 is housed.Lens driver 10 is used to make 11 of lens barrels to move to optical axis O direction.
As shown in Figure 1, lens driver 10 has the framework (housing) 12 of the roughly rectangular shape that covers lens barrel 11.In other words, configuration lens barrel 11 in framework (housing) 12.As shown in Figures 2 and 3, framework (housing) 12 comprises actuator base 14 and last side cover 16.
On the other hand, though not shown, be equipped with the imaging apparatus that is disposed on the substrate at the central portion of actuator base 14.This imaging apparatus looks like to make a video recording and be converted to electric signal to the subject by moving lens AFL imaging.Imaging apparatus is by formations such as for example CCD (charge coupled device) type imageing sensor, CMOS (complementary metal oxide semiconductor) type imageing sensors.
On the periphery wall of the cylindrical portion 182 of lens mount 18, has the place ahead at fore-and-aft direction X to the outstanding teat 184 in the radial direction outside.This teat 184 is used for cooperating with the part of the shape memory alloy wire 28 of described wire hereinafter.
In addition, as mentioned above, under the situation that reality is used, the last direction of Z-direction (optical axis O direction) become the place ahead to, the following direction of Z-direction (optical axis O direction) become the rear to.Therefore, upside leaf spring 22 is also referred to as the front side spring, and downside leaf spring 24 is also referred to as the rear side spring.
That is, upside leaf spring 22 has and is installed in the interior all side ends 222 on the lens mount 18 and is installed in outer circumferential side end 224 on the housing 12 as described later.Between interior all side ends 222 and outer circumferential side end 224, be provided with three arms.All side ends 222 and outer circumferential side end 224 in each arm connects.
Equally, downside leaf spring 24 has and is installed in the interior all side ends 242 on the lens mount 18 and is installed in outer circumferential side end 244 on the housing 12 as described later.Between interior all side ends 242 and outer circumferential side end 244, be provided with three arms.All side ends 242 and outer circumferential side end 244 in each arm connects.
In addition, interior all side ends are also referred to as inner ring, and the outer circumferential side end is also referred to as the outer ring.
Interior all side ends 222 of upside leaf spring 22 are fixed on the cylindrical portion 182 of lens mount 18.On the other hand, the outer circumferential side end 224 of upside leaf spring 22 is fixed on four teats 142 of actuator base 14.Outer circumferential side end 224 has four hole 224a at four jiaos.As shown in Figure 3, in these four hole 224a, four projection 142a that are formed on four teats 142 have been embedded respectively.
On the other hand, the outer circumferential side end 244 of downside leaf spring 24 utilizes leaf spring frame 26 to be fixed on the actuator base 14.In other words, the outer circumferential side end 244 of downside leaf spring 24 is held and is fixed between leaf spring frame 26 and the actuator base 14.Interior all side ends 242 of downside leaf spring 24 are fixed on bottom surface one side of lens mount 18.
The elastomeric element 20 that is made of a pair of leaf spring 22,24 can only work at the guide that optical axis O direction moves as guiding lens mount 18.Each of a pair of leaf spring 22,24 is made of beryllium-bronze, phosphor bronze etc.
Adopt such structure, lens movable part 11,18 can only be moved to optical axis O direction with respect to framework (housing) 12.
Below, except reference Fig. 3 and Fig. 4,, the installment state of shape memory alloy wire 28 is described also with reference to Fig. 5 and Fig. 6.Fig. 5 is the front view of lens driver 10 shown in Figure 3.Fig. 6 is the local amplification stereogram that amplifies the major part of expression lens driver 10 shown in Figure 5.
As shown in Figure 4, leaf spring frame 26 has the annulus 262 of the general toroidal made.Front portion at the fore-and-aft direction X of this annulus 262 is formed with groove 264.And leaf spring frame 26 has near this groove 264 and the outstanding teat 266 in top of direction Z up and down.
On the other hand, on actuator base 14, be formed with first groove 144, be formed with second groove 146 with above-mentioned teat 266 corresponding positions with above-mentioned groove 264 corresponding positions.
First and second electrodes 31,32 extend at above-below direction Z, and second electrode, 32 to the first electrodes 31 are long.As shown in Figure 6, first groove 144 of first electrode, 31 usefulness actuator bases 14 is fixing, and erects setting along the groove 264 of leaf spring frame 26.On the other hand, second groove 146 of second electrode, 32 usefulness actuator bases 14 is fixing, and remains on the teat 266 of leaf spring frame 26 and erect and be provided with.
As shown in Figure 6, first electrode 31 has and is bent into first connecting portion 312 that the cross section is the コ font in the end thereon.Similarly, second electrode 32 has and is bent into second connecting portion 322 that the cross section is the コ font in the end thereon.First electrode 31 is through carrying out caulking to first connecting portion 312 and being electrically connected with the first end 28a of shape memory alloy wire 28.Similarly, second electrode 32 is through carrying out caulking to second connecting portion 322 and being electrically connected with the second end 28b of shape memory alloy wire 28.
So, shape memory alloy wire 28 with state that first and second electrode 31,32 is electrically connected under be installed on the actuator base 14.
Shape memory alloy wire 28 has: from first connecting portion 312 of first electrode 31 first straight line portion 281 that extends of the left of direction Y to the left and right; From second connecting portion 322 of second electrode 32 second straight line portion 282 that extends of the left of direction Y to the left and right; And the connecting portion 283 that connects first straight line portion 281 and second straight line portion 282.
In illustrated embodiment, connecting portion 283 is essentially rectilinear form.Teat 184 at these connecting portion 283 fit lens framves 18.Shape memory alloy wire 28 has a flex point (inflection point) 28-1 at the connecting portion of first straight line portion 281 and connecting portion 283.The angle θ 1 of this flex point (inflection point) 28-1 is less than 90 °.
As everyone knows, so-called " marmem " is meant that having the deflection that obtains in advance becomes zero and recover the metal of the character of original form in specific temperature province.Marmem for example is made of the TiNi alloy.
Above-mentioned elastomeric element 20 plays along the effect afterburning downwards to lens mount 18 of optical axis O direction.On the other hand, shape memory alloy wire 28 then extends as if from driving circuit (not shown) it being switched on.Its result, lens mount 18 overcomes elastomeric element 20 downward acting forces and moves along optical axis O direction top.
On the other hand, as if the energising that stops shape memory alloy wire 28, then shape memory alloy wire 28 is cooled naturally.Its result shrinks owing to elastomeric element 20 downward acting forces make shape memory alloy wire 28.Its result, lens mount 18 moves along the optical axis O side of being directed downwards.
That is, shape memory alloy wire 28 is because its energising/caused temperature variation of not switching on and flexible along optical axis O direction, as lens mount 18 is worked to travel mechanism that optical axis O direction moves.
The combined support lens movable part 11,18 of elastomeric element 20 and shape memory alloy wire 28 can move it to optical axis O direction, plays a role as the lens drive division (20,28) that drives lens movable part 11,18 simultaneously.
As shown in Figure 5, lens drive division 20,28 and lens movable part 11,18 dispose side by side with respect to optical axis O.Therefore, can make the whole height of lens driver 10 lower.
The lens driver 10 of above-mentioned first embodiment has effect as described below.
Owing to use the elastomeric element 20 be configured between lens mount 18 and the housing 12, thereby need not to make lens mount 18 relative other parts slips as guide, 18 of lens mounts are moved to optical axis O direction.
Owing to shape memory alloy wire 28 is configured near the outer wall of cylindrical portion 182 of lens mount 18, thereby need not to reduce lens diameter, size in length and breadth that just can reducing glass drive unit 10 as the automatic focus lens AFL of moving lens.Thus, the lens diameter of automatic focus lens AFL is strengthened and satisfy the requirement of high-resolution camera.
In addition, as travel mechanism, owing to used the shape memory alloy wire 28 of wire with at least one flex point (inflection point) 28-1, thereby compare with spiral helicine shape memory alloy spring, can shorten the total length of shape memory alloy wire 28.Its result can make lens driver 10 miniaturizations.
By strengthening the angle θ 1 of this flex point (inflection point) 28-1, can increase the shape restoring force of shape memory alloy wire 28.Its result can improve the lens thrust of lens driver 10.
In addition, owing to play the part that the position of driving action has only flex point (inflection point) 28-1 of shape memory alloy wire 28, thereby other straight line portion 281,282,283 is directly very little to driving role.
Below, with reference to Fig. 7 and Fig. 8, the lens driver 10A of second embodiment of the invention is described.Fig. 7 is at the stereographic map of observing lens driver 10A under the state that has omitted lens barrel 11 and last side cover 16, above oblique the place ahead.Fig. 8 is the front view of lens driver 10A shown in Figure 7.
Illustrated lens driver 10A except the structure of the shape memory alloy wire of wire just like this point of hereinafter described difference, have with Fig. 1 to the identical structure of lens driver shown in Figure 6 10, going forward side by side action is done.Therefore, shape memory alloy wire is put on the reference marks of 28A.Put on identical reference marks and omitted explanation for the textural element identical, below only difference is described them with the textural element of lens driver 10.
Shape memory alloy wire 28A except the structure of connecting portion just like this point of hereinafter described difference, have with Fig. 3 to the identical structure of shape memory alloy wire shown in Figure 6 28.Therefore, connecting portion is put on the reference marks of 283A.
Connecting portion 283A is essentially the S word shape.In detail, connecting portion 283A comprises: connect straight line portion 283A1 from the leading section of first straight line portion 281 to first of oblique upper right side extension; Connect straight line portion 283A2 from the leading section of second straight line portion 282 to second of oblique lower left extension; And connect first and connect straight line portion 283A1 is connected straight line portion 283A2 with second the 3rd connection straight line portion 283A3.Teat 184 at the second connection straight line portion 283A2 fit lens frame 18.
Shape memory alloy wire 28A has: be positioned at first straight line portion 281 is connected the connecting portion of straight line portion 283A1 with first first flex point (inflection point) 28-1; Be positioned at first and connect straight line portion 283A1 is connected the connecting portion of straight line portion 283A3 with the 3rd second flex point (inflection point) 28-2; And be positioned at second and connect straight line portion 283A2 is connected the connecting portion of straight line portion 283A3 with the 3rd the 3rd flex point (inflection point) 28-3.Each angle θ 2 of first to the 3rd flex point (inflection point) 28-1～28-3 is less than 45 °
The lens driver 10A of this structure is owing to carry out the action identical with the lens driver 10 of above-mentioned first embodiment, thereby omitted the explanation to its action.
In a word, shape memory alloy wire 28A is owing to its temperature variation of causing and flexible in optical axis O direction of switch on/not switching on, as lens mount 18 is worked to travel mechanism that optical axis O direction moves.
The combined support lens movable part 11,18 of elastomeric element 20 and shape memory alloy wire 28A can move it along optical axis O direction, plays a role as the lens drive division 20 that drives lens movable part 11,18,28A simultaneously.
As shown in Figure 8, lens drive division 20,28A and lens movable part 11,18 dispose side by side with respect to optical axis O.Therefore, can make the whole height of lens driver 10A lower.
The lens driver 10A of above-mentioned second embodiment has effect as described below.
Owing to use the elastomeric element 20 be configured between lens mount 18 and the housing 12, thereby need not to make lens mount 18 relative other parts slips as guide, 18 of lens mounts are moved to optical axis O direction.
Owing to shape memory alloy wire 28A is configured near the outer wall of cylindrical portion 182 of lens mount 18, thereby need not to reduce lens diameter, size in length and breadth that just can reducing glass drive unit 10A as the automatic focus lens AFL of moving lens.Thus, the lens diameter of automatic focus lens AFL is strengthened and satisfy the requirement of high-resolution camera.
In addition, as travel mechanism, owing to used the shape memory alloy wire 28A of wire, thereby compared, can shorten the total length of shape memory alloy wire 28A with spiral helicine shape memory alloy spring with first to the 3rd flex point (inflection point) 28-1～28-3.Its result can make lens driver 10A miniaturization.
By strengthening each angle θ 2 of first to the 3rd flex point (inflection point) 28-1～28-3, can increase the shape restoring force of shape memory alloy wire 28A.Its result can improve the lens thrust of lens driver 10A.In addition, because shape memory alloy wire 28A has three flex points (inflection point) 28-1～28-3, thereby the thrust can strengthen lens focus the time.
Below, with reference to Fig. 9 to Figure 12, the lens driver 10B of third embodiment of the invention is described.Fig. 9 is at the stereographic map of observing lens driver 10B under the state that has omitted lens barrel 11 and last side cover 16, above oblique the place ahead.Figure 10 is a stereographic map of observing lens driver 10B shown in Figure 9 from the top at oblique rear.Figure 11 is the front view of lens driver 10B shown in Figure 9.Figure 12 is the stereographic map of configuration of lens mount, shape memory alloy wire and the pair of electrodes of expression lens driver 10B shown in Figure 9.
Illustrated lens driver 10B except the structure of shape memory alloy wire, actuator base, leaf spring frame, second electrode and the lens mount of wire just like this point of hereinafter described difference, have with Fig. 1 to the identical structure of lens driver shown in Figure 6 10, going forward side by side action is done.Therefore, put on reference marks 28B, 14A, 26A, 32A and 18A respectively for shape memory alloy wire, actuator base, leaf spring frame, second electrode and lens mount.Put on identical reference marks for the textural element identical, and omitted explanation, below only difference is described them with the textural element of lens driver 10.
The installment state of shape memory alloy wire 28B at first, is described.
Second its length of electrode 32A and configuration position are different with second electrode 32.That is, the second electrode 32A has the length identical with first electrode 31.As shown in figure 10, the second electrode 32A is at the back side of actuator base 14A, fixes with the second groove 146A of actuator base 14A, and erects along the second groove 266A of leaf spring frame 26A and to be provided with.Second electrode 32A end thereon has and is bent into the second connecting portion 322A that the cross section is the コ font.
So, shape memory alloy wire 28B just with state that first and second electrode 31,32A are electrically connected under be installed on the actuator base 14A.
Shape memory alloy wire 28B except the structure of second straight line portion and connecting portion has as described later difference, have with Fig. 3 to the identical structure of shape memory alloy wire shown in Figure 6 28.Therefore, second straight line portion and connecting portion are put on the reference marks of 282A and 283B respectively.
The second straight line portion 282A as shown in figure 10, the rear side of lens driver 10B from the second connecting portion 322A of the second electrode 32A to the left and right the left of direction Y extend.
Connecting portion 283B is along the periphery wall configuration of the cylindrical portion 182 of lens mount 18A.In detail, connecting portion 283B comprises: connect straight line portion 283B1 from the leading section of first straight line portion 281 to first of oblique upper right side extension; Connect straight line portion 283B2 from the leading section of the second straight line portion 282A to second of oblique upper right side extension; And be circular-arc connection first and connect straight line portion 283B1 is connected straight line portion 283B2 with second the circular-arc part 283B3 of connection.At first and second teat 184 and 186 that connects circular-arc part 283B3 fit lens frame 18A.
Shape memory alloy wire 28B has: be positioned at first straight line portion 281 is connected the connecting portion of straight line portion 283B1 with first first flex point (inflection point) 28-1; Be positioned at second flex point (inflection point) 28-2 of the first connection straight line portion 283B1 and the connecting portion that is connected circular-arc part 283B3; Be positioned at and connect circular-arc part 283B3 is connected the connecting portion of straight line portion 283B2 with second the 3rd flex point (inflection point) 28-3; And the 4th flex point (inflection point) 28-4 that is positioned at the connecting portion of the second connection straight line portion 283B2 and the second straight line portion 282A.Each angle θ 3 of first to fourth flex point (inflection point) 28-1～28-4 is less than 90 °.
The lens driver 10B of this structure is owing to carry out the action identical with the lens driver 10 of above-mentioned first embodiment, thereby omitted the explanation to its action.
In a word, shape memory alloy wire 28B is owing to its temperature variation of causing and flexible in optical axis O direction of switch on/not switching on, as lens mount 18A is worked to travel mechanism that optical axis O direction moves.
The combined support lens movable part 11 of elastomeric element 20 and shape memory alloy wire 28B, 18A can move it along optical axis O direction, play a role as the lens drive division 20 that drives lens movable part 11,18A, 28A simultaneously.
As shown in figure 11, lens drive division 20,28B and lens movable part 11,18A dispose side by side with respect to optical axis O.Therefore, can make the whole height of lens driver 10B lower.
The lens driver 10B of above-mentioned the 3rd embodiment has effect as described below.
As guide owing to use the elastomeric element 20 be configured between lens mount 18A and the housing 12, thereby need not to make lens mount 18A relatively other parts slide, just can make lens mount 18A to move to optical axis O direction.
Owing to shape memory alloy wire 28B is configured near the outer wall of cylindrical portion 182 of lens mount 18A, thereby need not to reduce lens diameter, size in length and breadth that just can reducing glass drive unit 10B as the automatic focus lens AFL of moving lens.Thus, the lens diameter of automatic focus lens AFL is strengthened and satisfy the requirement of high-resolution camera.
In addition, as travel mechanism, owing to used the shape memory alloy wire 28B of wire, thereby compared, can shorten the total length of shape memory alloy wire 28B with spiral helicine shape memory alloy spring with first to fourth flex point (inflection point) 28-1～28-4.Its result can make lens driver 10B miniaturization.
By strengthening each angle θ 3 of first to fourth flex point (inflection point) 28-1～28-4, can increase the shape restoring force of shape memory alloy wire 28B.Its result can improve the lens thrust of lens driver 10B.In addition, because shape memory alloy wire 28B has four flex points (inflection point) 28-1～28-4, thereby the thrust can strengthen lens focus the time.
More than, though describe the present invention by preferred implementation, obviously, in the scope that does not break away from spirit of the present invention, those skilled in the art can carry out various distortion.For example, in the above-described embodiment, though elastomeric element is made of a pair of leaf spring of the optical axis direction both sides of the cylindrical portion that is arranged at lens mount, be not limited thereto, can be so long as need not to make relative other parts of lens mount to slide to the structure of its channeling conduct, any structure all can.
Claims (8)
1. lens driver possesses: the lens mount with the cylindrical portion that is used to keep lens barrel; Support the housing that the said lens frame makes that this lens mount can only move to optical axis direction; Make the said lens frame to travel mechanism that optical axis direction moves; And the guiding said lens frame guide that can only move to above-mentioned optical axis direction, it is characterized in that,
Above-mentioned guide comprises the elastomeric element that is configured between said lens frame and the above-mentioned housing, and this elastomeric element supports the said lens frame and makes that the said lens frame can only be shifted to above-mentioned optical axis direction under the state that radially the said lens frame has been carried out the location,
Above-mentioned travel mechanism by near the outer wall of the cylindrical portion that is configured in the said lens frame and the shape memory alloy wire of the wire that cooperates with the said lens frame constitute, this shape memory alloy wire has at least one flex point.
2. lens driver according to claim 1 is characterized in that,
Above-mentioned elastomeric element is made of a pair of leaf spring of the optical axis direction both sides of the cylindrical portion that is arranged on the said lens frame, and each of above-mentioned a pair of leaf spring has interior all side ends that are installed on the said lens frame and the outer circumferential side end that is installed on the above-mentioned housing.
3. lens driver according to claim 1 and 2 is characterized in that,
The said lens frame has from above-mentioned cylindrical portion outstanding to the radial direction outside, and at least one teat that cooperates with above-mentioned shape memory alloy wire.
4. lens driver according to claim 3 is characterized in that,
The actuator base that above-mentioned housing has the lower side that is disposed at the said lens frame reaches the last side cover that covers the said lens frame from upside,
Have and be fixed on the above-mentioned actuator base, and first and second electrode that is electrically connected respectively with first and second end of above-mentioned shape memory alloy wire.
5. lens driver according to claim 4 is characterized in that,
Above-mentioned shape memory alloy wire has a flex point, and the angle of this flex point is less than 90 °.
6. lens driver according to claim 4 is characterized in that,
Above-mentioned shape memory alloy wire has a plurality of flex points, and the angle of each flex point is less than 45 °.
7. lens driver according to claim 4 is characterized in that,
The said lens frame has from above-mentioned cylindrical portion outstanding to the radial direction outside in relative mutually position, and first and second teat that cooperates with above-mentioned shape memory alloy wire,
Above-mentioned first and second electrode is configured in the two ends of above-mentioned actuator base respectively,
Above-mentioned shape memory alloy wire comprises the circular-arc part that is circular-arc configuration along the outer wall of the cylindrical portion of said lens frame.
8. lens driver according to claim 7 is characterized in that,
Above-mentioned shape memory alloy wire has a plurality of flex points, and the angle of each flex point is less than 90 °.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-113822 | 2009-05-08 | ||
| JP2009113822A JP2010262178A (en) | 2009-05-08 | 2009-05-08 | Lens drive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101881872A true CN101881872A (en) | 2010-11-10 |
Family
ID=43053927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101678786A Pending CN101881872A (en) | 2009-05-08 | 2010-04-26 | Lens driver |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2010262178A (en) |
| KR (1) | KR20100121407A (en) |
| CN (1) | CN101881872A (en) |
| TW (1) | TW201044047A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272138A (en) * | 2016-04-01 | 2017-10-20 | 台湾东电化股份有限公司 | Lens driving mechanism and control method thereof |
| CN107462964A (en) * | 2016-06-06 | 2017-12-12 | 新科实业有限公司 | The assemble method of SMA components and OIS devices |
| CN109901275A (en) * | 2017-12-08 | 2019-06-18 | 宁波舜宇光电信息有限公司 | The method of SMA wire is wound on optical module |
| CN110174741A (en) * | 2019-06-01 | 2019-08-27 | 瑞声科技(新加坡)有限公司 | Stationary lens mould group |
| CN110703537A (en) * | 2018-07-09 | 2020-01-17 | 三星电机株式会社 | Camera module and portable electronic device |
| WO2021218840A1 (en) * | 2020-04-30 | 2021-11-04 | 维沃移动通信有限公司 | Driving apparatus and electronic device |
| US11598975B2 (en) | 2016-04-01 | 2023-03-07 | Tdk Taiwan Corp. | Lens driving mechanism and method for controlling the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014049963A1 (en) * | 2012-09-28 | 2014-04-03 | コニカミノルタ株式会社 | Drive device production method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4353921B2 (en) * | 2003-05-12 | 2009-10-28 | 三菱電機株式会社 | Driving device, lens driving device, and camera |
| JP2007078954A (en) * | 2005-09-13 | 2007-03-29 | Konica Minolta Opto Inc | Lens barrel and imaging apparatus equipped therewith |
| JP4858808B2 (en) * | 2005-08-22 | 2012-01-18 | コニカミノルタオプト株式会社 | LENS DRIVE DEVICE, IMAGING DEVICE, AND LENS DRIVE METHOD |
| JP2009025693A (en) * | 2007-07-23 | 2009-02-05 | Konica Minolta Opto Inc | Driving mechanism, driving device and lens driving device |
-
2009
- 2009-05-08 JP JP2009113822A patent/JP2010262178A/en active Pending
-
2010
- 2010-04-01 KR KR1020100029760A patent/KR20100121407A/en not_active Application Discontinuation
- 2010-04-26 CN CN2010101678786A patent/CN101881872A/en active Pending
- 2010-04-30 TW TW099113959A patent/TW201044047A/en unknown
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272138A (en) * | 2016-04-01 | 2017-10-20 | 台湾东电化股份有限公司 | Lens driving mechanism and control method thereof |
| CN111913267A (en) * | 2016-04-01 | 2020-11-10 | 台湾东电化股份有限公司 | Lens driving mechanism |
| US11598975B2 (en) | 2016-04-01 | 2023-03-07 | Tdk Taiwan Corp. | Lens driving mechanism and method for controlling the same |
| CN107462964A (en) * | 2016-06-06 | 2017-12-12 | 新科实业有限公司 | The assemble method of SMA components and OIS devices |
| CN109901275A (en) * | 2017-12-08 | 2019-06-18 | 宁波舜宇光电信息有限公司 | The method of SMA wire is wound on optical module |
| CN109901275B (en) * | 2017-12-08 | 2021-05-18 | 宁波舜宇光电信息有限公司 | Method of winding SMA wire on optical assembly |
| CN110703537A (en) * | 2018-07-09 | 2020-01-17 | 三星电机株式会社 | Camera module and portable electronic device |
| CN110703537B (en) * | 2018-07-09 | 2022-08-05 | 三星电机株式会社 | Camera module and portable electronic device |
| CN110174741A (en) * | 2019-06-01 | 2019-08-27 | 瑞声科技(新加坡)有限公司 | Stationary lens mould group |
| WO2021218840A1 (en) * | 2020-04-30 | 2021-11-04 | 维沃移动通信有限公司 | Driving apparatus and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201044047A (en) | 2010-12-16 |
| JP2010262178A (en) | 2010-11-18 |
| KR20100121407A (en) | 2010-11-17 |
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Application publication date: 20101110 |